Some factors can make to vary the exactness of the counting, can also cite the volume of excrements really eliminated by the patient and the amount of staple fibres and water contained in excrements. Evidently, the method does not apply liquid excrements (REY et al., 2008). It must to stand out that in infections exclusively with female worms, all the expelled eggs will be infertile, whereas in infections with male worms the excrement examination will only be consequently negative (SNOWS et al., 2008). The eggs of Ascaris conserve per weeks or months well. The gotten results can vary of one day for another one in function of the irregularity with that they are after to you them and eliminated eggs. Also consequences of fibrose intestinal, that if it presents in the cases of chronic patients, and makes it difficult the expulsion of eggs through in-testinal mucosa (REY et al., 2008).
2.3.Patogenia the contamination for verminoses can acometer the health of the people bringing to them would be complications the life. In this way, it is observed that the individual that acquired verminoses these subject to symptoms as me - the absorption, anemia, development of a lesser capacity of work, low pertaining to school income (VINE, 1976), diarria, clicas, physical development and mental slow and in some cases it can take the death (LEATHER STRAP et al., 2005). In many cases the parasatism is assintomtica mainly in children, the symptoms generally happen when it has a more numerous infection of worms or larvae, or anomalous migratory localizations (MELO et al., 2004). The pathogenic action generally is developed in two stages: during the migration of the larvae and when the adult worm meets in its definite habitat. In such a way the injury will depend on the number of larvae, the fabric and the sensitivity of the host (REY, 2008). In the phase of larvria invasion, the importance of the injuries depends on the number of larvae of the fabric, where if they find the sensitivity of the host.